Formaldehyde: FDA Regulatory Status, State Bans & Global Restrictions

What Is Formaldehyde?

Formaldehyde (CH₂O) is a naturally occurring organic compound — a colorless, pungent gas at room temperature that dissolves readily in water to form formalin (typically 37% formaldehyde by weight). In solution, formaldehyde exists primarily as methylene glycol (HOCH₂OH) and its oligomers, a chemical distinction that has become central to regulatory and legal disputes over product labeling.

Property	Value
Chemical Name	Formaldehyde (methanal)
CAS Number	50-00-0
UNII	1HG84L3525
Molecular Formula	CH₂O
Molecular Weight	30.03 g/mol
IARC Classification	Group 1 (carcinogenic to humans)
Related Forms	Methylene glycol, paraformaldehyde, formalin

The human body produces formaldehyde endogenously as part of one-carbon metabolism — a healthy adult carries roughly 2.5 micrograms per milliliter of formaldehyde in their blood at any given time. For over a century, it has been deployed across the industrial economy: as a preservative, disinfectant, crosslinking agent in textiles, resin precursor in manufacturing, and — most controversially — as an ingredient in cosmetic products marketed to millions of consumers.

Formaldehyde-Releasing Preservatives (FRPs)

A critical compliance consideration: formaldehyde is not always listed directly on product labels. Many cosmetic preservatives slowly release formaldehyde over time. The most common include:

• DMDM hydantoin — the most widely used FRP in shampoos, body washes, and lotions
• Quaternium-15 — found in blush, mascara, lotions; the most sensitizing of the FRPs
• Imidazolidinyl urea — used in skincare, shampoo, and eye shadow
• Diazolidinyl urea — similar use profile
• Bronopol (2-bromo-2-nitropropane-1,3-diol) — used in rinse-off products
• Sodium hydroxymethylglycinate — found in baby wipes, cleansers, and leave-on products

Washington State's 2025 rulemaking specifically identified 25 formaldehyde-releasing chemicals by name — the broadest FRP ban in any U.S. jurisdiction.

FDA Regulatory Status

Hair Straightening Products — Proposed Ban (RIN 0910-AI83)

The most significant pending FDA action on formaldehyde is the proposed rulemaking to ban formaldehyde and formaldehyde-releasing chemicals in hair smoothing and straightening products. This rule would be one of the first ingredient-specific bans under MoCRA.

Hair straightening treatments containing formaldehyde or methylene glycol release formaldehyde gas when heated during application. Salon workers and consumers are exposed to airborne concentrations that routinely exceed OSHA's permissible exposure limits. The long-term effects are the reason this proposed rule exists — and a 2022 NIH study found that women who used hair straightening products more than four times per year had more than double the risk of developing uterine cancer.

The FDA has now missed its own deadline for publishing this proposed rule six times:

Planned Date	Outcome
October 2023	Missed
April 2024	Missed
July 2024	Missed
November 2024	Missed
March 2025	Missed
December 31, 2025	Missed

As of March 2026, the agency has stated only that the rule remains "a priority" without providing a new target date. The change in presidential administrations and broader deregulatory signals have raised serious questions about whether the proposed rule will be published during the current administration's term.

Indirect Food Additives

Formaldehyde-based resins remain authorized under multiple sections of 21 CFR:

• 21 CFR 175.105 — Formaldehyde-based resins in food packaging adhesives
• 21 CFR 177.1460 — Melamine-formaldehyde resins in molded food-contact articles
• 21 CFR 177.1900 — Urea-formaldehyde resins in molded food-contact articles
• 21 CFR 173.340 — Formaldehyde in defoaming agent formulations

These authorizations are longstanding and not currently under review. Formaldehyde is polymerized into the resin matrix, with only trace migration into food.

Biologics: Vaccine Manufacturing

Formaldehyde has been used for decades as an inactivating agent in vaccine production — it renders the virus in inactivated vaccines (polio, hepatitis A, influenza) incapable of causing disease. Residual formaldehyde in the final product is typically below 0.02 mg per dose, far below the approximately 50 micrograms per milliliter that occur naturally in an infant's bloodstream.

OSHA Workplace Standards (29 CFR 1910.1048)

Measure	Limit
PEL (8-hr TWA)	0.75 ppm
STEL (15-min)	2 ppm
Action Level	0.5 ppm

Key Deadlines

Date	Event	Type
January 1, 2025	California AB 2762, Maryland HB 643, Colorado HB 22-1345 cosmetic bans effective	State
December 31, 2025	FDA proposed rule deadline (missed — 6th delay)	Federal
April 1, 2026	MDL 3060 bellwether case selection deadline	Legal
June 10, 2026	MDL 3060 additional fact discovery closes	Legal
August 6, 2026	EU REACH Entry 77 formaldehyde emission limits enforceable	International
January 1, 2027	Washington formaldehyde-releasing chemicals ban effective	State
August 6, 2027	EU REACH vehicle interior formaldehyde limits enforceable	International
TBD	FDA NPRM on formaldehyde in hair straightening (RIN 0910-AI83)	Federal

IARC Classification

Formaldehyde is classified as Group 1: Carcinogenic to humans by IARC — the highest level of certainty.

• 2004: IARC classified formaldehyde as Group 1 based on sufficient evidence for nasopharyngeal cancer
• 2006: Full monograph published (Volume 88)
• 2009/2012: Reaffirmed Group 1 and expanded to include leukemia (specifically myeloid leukemia) and sinonasal cancer (Monograph Volume 100F)

The U.S. National Toxicology Program lists formaldehyde as "known to be a human carcinogen." The EU classifies it as a CMR 1B substance under the CLP Regulation.

The Brazilian Blowout Crisis (2010-2012)

The modern regulatory story of formaldehyde in cosmetics begins with Brazilian Blowout — a keratin hair smoothing treatment that was marketed as "formaldehyde-free" while containing methylene glycol, which converts back to formaldehyde gas when heated during application.

In October 2010, Oregon OSHA tested 105 product samples from 54 salons — more than one-third containing significant formaldehyde levels came from Brazilian Blowout products. NIOSH testing in May 2011 showed six of seven short-term air quality tests exceeded exposure limits. On August 22, 2011, the FDA issued a warning letter to GIB LLC (Brazilian Blowout's manufacturer), declaring it an "adulterated cosmetic." OSHA found formaldehyde levels at five times the STEL in one salon.

In January 2012, California Attorney General Kamala Harris announced a $600,000 settlement requiring labeling changes.

The episode exposed three structural problems: the methylene glycol labeling loophole, FDA's limited pre-MoCRA authority, and the disproportionate exposure borne by salon workers — predominantly women and disproportionately women of color.

The Hair Straightener Cancer Litigation (MDL No. 3060)

While the regulatory process stalls, the courts have moved forward. The hair straightener/relaxer cancer litigation is now one of the largest active mass tort proceedings in the United States.

The litigation was catalyzed by a 2022 NIH study (Sister Study cohort, ~33,000 women) finding that frequent use of hair straightening products more than doubled uterine cancer risk. In February 2023, the Judicial Panel on Multidistrict Litigation consolidated lawsuits into MDL No. 3060, assigned to Judge Mary M. Rowland in the Northern District of Illinois.

As of March 2026, MDL No. 3060 includes approximately 11,400 pending cases. Principal defendants include L'Oreal, Revlon, and Strength of Nature. Key upcoming milestones:

• April 1, 2026 — Daubert challenges; bellwether case selection begins
• June 10, 2026 — Fact discovery closes for bellwether cases
• 2027 (estimated) — First bellwether trials

MoCRA Implications

The Modernization of Cosmetics Regulation Act of 2022 (MoCRA) gives FDA new powers relevant to formaldehyde:

• Mandatory adverse event reporting — Formaldehyde-related incidents now create a documented record
• Facility registration and product listing — Creates transparency that didn't exist during Brazilian Blowout era
• Mandatory recall authority — FDA can now order cosmetics recalls
• Ingredient safety substantiation — Companies bear the burden of demonstrating product safety

MoCRA's registration requirements took effect July 1, 2024. For companies still manufacturing products containing formaldehyde or FRPs, the combination of mandatory reporting and enhanced FDA authority means the regulatory risk profile has changed fundamentally.

State Bans

Currently in Effect

California (AB 2762 — Toxic-Free Cosmetics Act) — Effective January 1, 2025. Prohibits formaldehyde, paraformaldehyde, and methylene glycol in cosmetics. Does NOT ban FRPs.

Maryland (HB 643) — Effective January 1, 2025. Prohibits formaldehyde in cosmetics.

Colorado (HB 22-1345) — Effective January 1, 2025. Bans formaldehyde in cosmetics.

Adopted, Not Yet Effective

Washington (HB 1047 + WAC 173-399) — The first state to ban all formaldehyde-releasing chemicals in cosmetics. 25 specific FRP chemicals identified. Effective January 1, 2027 for manufacturers; retailer sell-through ends January 1, 2028.

Pending

Virginia (HB 122) — Would ban formaldehyde and methylene glycol in cosmetics. Pending as of March 2026.

International Status

European Union

Under Cosmetics Regulation (EC) No 1223/2009, free formaldehyde is prohibited as a cosmetic ingredient. FRPs are permitted under Annex V at maximum 0.2% (non-oral) and 0.1% (oral). Commission Regulation (EU) 2022/1181 lowered the labeling threshold from 500 ppm to 10 ppm — new products must comply since July 31, 2024; sell-through until July 31, 2026.

Regulation (EU) 2023/1464 (REACH Entry 77) sets emission limits for articles: 0.062 mg/m³ for furniture/wood products, 0.080 mg/m³ for all other articles, enforceable August 6, 2026.

Canada

Health Canada restricts formaldehyde to 0.2% in non-oral cosmetics, 0.1% in oral products, and 0.01% in heated hair products — functionally a ban on hair straightening treatments.

Japan

Formaldehyde restricted to 0.2% in cosmetics; banned in aerosol products.

Affected Product Categories

Cosmetics (highest risk):

• Hair straightening and smoothing treatments
• Nail hardeners and nail polish
• Shampoos, conditioners, body washes (via FRP preservatives)
• Skin care products with FRP preservatives
• Eyelash glue

Food Contact Materials:

• Melamine-formaldehyde dishware
• Urea-formaldehyde molded articles
• Adhesives in food packaging

Pharmaceutical and Biological Products:

• Vaccines (inactivating agent)
• OTC topical drug products

What Companies Should Do

Immediate Actions

1. Audit formulations for both free formaldehyde AND FRPs. Check for all six common formaldehyde-releasing preservatives, not just "formaldehyde" on the label.

2. Confirm California/Maryland/Colorado compliance. AB 2762 has been enforceable since January 1, 2025.

3. Assess Prop 65 exposure. Formaldehyde has been listed as a known carcinogen since 1988.

Medium-Term Actions

4. Prepare for Washington's FRP ban. The January 1, 2027 effective date means reformulation must begin now for products containing any of the 25 identified chemicals.

5. Develop formaldehyde-free preservative systems. Common replacements: phenoxyethanol, ethylhexylglycerin, sodium benzoate/potassium sorbate combinations.

6. Monitor the FDA NPRM. RIN 0910-AI83 may be delayed, but it is not withdrawn.

7. Prepare for EU REACH. August 6, 2026 emission limits for exported products.

8. Document MoCRA safety substantiation. The combination of IARC Group 1 classification and active mass tort litigation sets a high bar.

Regulatory Intelligence

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